Please sit up straight in class.上课坐正。
Listen carefully in class.上课听讲
Take notes when necessary in class.上课需要时做笔记
Put up your hand and Ask the teacher when you don't understand in class.上课不懂时要举手问老师
Stand up straight and greet the teacher when classes begin or dismiss.上下课要起立并向老师敬礼